如果未返回任何内容，如何将localStorage值设置为数字1？

Question

Here is what I have tried so far:

this.phrasesOrderById = 
   parseInt(storage.getItem('phrasesOrderById').toInt(),10) || 1;

However this gives me a message saying cannot read property toInt of null.

Can someone give me some advice on how I can set the value to 1 if a null is returned from getItem? Note that I spread this one line across two as it doesn't seem to display properly when it's just one line.

Answer 1

以下作品

    phrasesOrderById = parseInt(localStorage.getItem("phrasesOrderById") || 1);

Answer 2

you can use the ? : (conditional) operator in JavaScript

this.phrasesOrderById = storage.getItem('phrasesOrderById')?parseInt(storage.getItem('phrasesOrderById').toInt(),10):1;

Or you can simply use If/Else

if(storage.getItem('phrasesOrderById') {

    this.phrasesOrderById = parseInt(storage.getItem('phrasesOrderById').toInt(), 10);
}
else{

    this.phrasesOrderById = 1;
}